الفهرس 
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Abstract
Aim: to compare the digital 3d printed window transfer tray and the conventional thermoformed
tray regarding the accuracy of transferring the attachments, bond failure and chair side
time.Methodology: A randomized controlled trial was performed the two different bonding
techniques, 6 subjects were recruited in this study with 144 attachments. In the control group, the
orthodontic attachments were bonded to working models and scanned with an intraoral scanner to
make STL file of the working model. The transfer tray was then fabricated in order to transfer the
orthodontic attachments in to the patient’s mouth. While in the intervention group, the teeth were
scanned with the same intraoral scanner to produce the digital model on which the virtual
attachments are placed using the OrthoAnalyzer software. The tray was designed and printed with
windows opened gingivally. The attachments were fitted into their positions through the windows
of the tray. Then intraoral scanning for both groups was done to obtain STL models after bonding.
Superimposition of the pre and post STL models was done using 3Shape OrthoAnalyzer software
to measure the linear deviations (mesio-distal, occluso-gingival and bucco-lingual) and angular
deviations (tip, torque and rotation).Results: There was no statistically significant difference
between both techniques for overall accuracy of transfer in all linear and angular deviation except
for bucco-lingual linear deviation which revealed higher accuracy of transfer for 3D printed
technique than vacuum formed tray. The attachment failure rate was higher in vacuum formed tray
than 3d printed window tray that had zero bond failure in all attachments. Chair side time difference
between the two indirect bonding techniques was statistically insignificant.Conclusions: Vacuum
formed tray and 3D printed window transfer tray showed comparable degree of accuracy and chair
time with significant lower level of bond failure3D printed window transfer tray.